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Formulation optimization of propranolol hydrochloride microcapsules employing central composite design
H N Shivakumar1, R Patel, B G Desai
1Department of Pharmaceutical Technology, K. L. E. S's College of Pharmacy, Rajajinagar, 2 Block, Bangalore-560 010, India.
Indian Journal of Pharmaceutical Sciences
|January 5, 2010
Summary
This study optimized propranolol hydrochloride microcapsules using cellulose acetate butyrate and Span-80. The developed formulation demonstrated excellent encapsulation efficiency and extended drug release, meeting USP standards for extended-release capsules.
Area of Science:
- Pharmaceutical Technology
- Drug Delivery Systems
- Materials Science
Background:
- Propranolol hydrochloride is a widely used beta-blocker requiring controlled release for improved therapeutic outcomes.
- Microencapsulation offers a viable strategy for developing extended-release formulations of propranolol hydrochloride.
- Optimizing microencapsulation parameters is crucial for achieving desired drug release profiles and enhancing bioavailability.
Purpose of the Study:
- To develop and optimize microcapsules of propranolol hydrochloride using cellulose acetate butyrate and Span-80 via an oil-in-oil emulsion solvent evaporation technique.
- To investigate the influence of cellulose acetate butyrate level and Span-80 concentration on microencapsulation efficiency and drug release kinetics.
- To establish mathematical models predicting formulation performance and identify an optimized formulation meeting specific release criteria.
Main Methods:
- A central composite design was utilized to systematically study the effects of formulation variables.
- Oil-in-oil (o/o) emulsion solvent evaporation technique was employed for microcapsule preparation.
- Multiple linear regression analysis and analysis of variance (ANOVA) were used to generate predictive models and assess variable significance.
Main Results:
- Both cellulose acetate butyrate and Span-80 significantly influenced encapsulation efficiency.
- Cellulose acetate butyrate level was the primary factor affecting drug release over 24 hours.
- The optimized formulation achieved high encapsulation efficiency (92.86%) and exhibited extended drug release, closely matching model predictions.
- Drug release followed first-order kinetics and adhered to the Higuchi diffusion model.
Conclusions:
- The optimized microcapsule formulation of propranolol hydrochloride effectively controls drug release, meeting USP extended-release specifications.
- Cellulose acetate butyrate and Span-80 are critical parameters for successful microencapsulation of propranolol hydrochloride.
- This study provides a robust methodology for developing extended-release drug delivery systems with predictable release profiles.
Keywords:
cellulose acetate butyratecentral composite designo/o emulsionpropranolol hydrochlorideresponse surface methodologyMore Related Videos
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